<template>
  <div class="article-container">
    <!-- 导航栏 -->
    <van-nav-bar
      class="page-nav-bar"
      left-arrow
      title="黑马头条"
      @click-left="$router.back()"
    ></van-nav-bar>
    <!-- /导航栏 -->

    <div class="main-wrap">
      <!-- 加载中 -->
      <div class="loading-wrap" v-if="code === 1">
        <van-loading color="#3296fa" vertical>加载中</van-loading>
      </div>
      <!-- /加载中 -->

      <!-- 加载完成-文章详情 -->
      <div class="article-detail markdown-body" v-if="code === 2">
        <!-- 文章标题 -->
        <h1 class="article-title">{{ articleInfo.title }}</h1>
        <!-- /文章标题 -->

        <!-- 用户信息 -->
        <van-cell class="user-info" center :border="false">
          <van-image
            class="avatar"
            slot="icon"
            round
            fit="cover"
            :src="articleInfo.aut_photo"
          />
          <div slot="title" class="user-name">黑马头条号</div>
          <div slot="label" class="publish-date">
            {{ articleInfo.pubdate | relativeTime }}
          </div>
          <!-- 关注开始 -------------------->
          <!-- <follow-user
            :authorId="articleInfo.aut_id"
            :isFollowed="articleInfo.is_followed"
            @update-followed="articleInfo.is_followed = $event"
          ></follow-user> -->
          <!-- 在组件中出现v-model,说明： 
          1.父组件向子组件传值
          2.子组件修改值
          3.是input  和 val 的语法糖
           -->
          <follow-user
            :author-id="articleInfo.aut_id"
            v-model="articleInfo.is_followed"
          ></follow-user>
          <!-- 关注结束 -------------------------->
        </van-cell>
        <!-- /用户信息 -->

        <!-- 文章内容 -->
        <div
          class="article-content"
          ref="content"
          v-html="articleInfo.content"
        ></div>
        <van-divider>正文结束</van-divider>
        <!-- 底部区域 -->
        <div class="article-bottom">
          <van-button class="comment-btn" type="default" round size="small"
            >写评论</van-button
          >

          <van-icon name="comment-o" info="123" color="#777" />
          <!-- <van-icon color="#777" name="star-o" /> -->
          <!-- --------收藏操作开始------------- -->
          <!--    <collect-article :value="articleInfo.is_collected" :article-id= 'articleId' @input="articleInfo.is_collected =$event"></collect-article> -->
          <collect-article
            v-model="articleInfo.is_collected"
            :article-id="articleId"
          ></collect-article>
          <!-- -----------收藏操作结束--------- -->
          <!---------------------- 点赞开始部分-------------- -->
          <zan-article
            :value="articleInfo.attitude"
            :article-id="articleId"
            @input="articleInfo.attitude = $event"
          ></zan-article>
          <!---------------------- 点赞结束部分-------------- -->
<!-- ----转发开始部分-------------------------- -->
          <van-icon name="share" color="#777777"></van-icon>
<!-- --------转发结束部分-------------------------------- -->

        </div>
        <!-- /底部区域 -->
      </div>
      <!-- /加载完成-文章详情 -->

      <!-- 加载失败：404 -->
      <div class="error-wrap" v-if="code === 3">
        <van-icon name="failure" />
        <p class="text">该资源不存在或已删除！</p>
      </div>
      <!-- /加载失败：404 -->

      <!-- 加载失败：其它未知错误（例如网络原因或服务端异常） -->
      <div class="error-wrap" v-if="code === 4">
        <van-icon name="failure" />
        <p class="text">内容加载失败！</p>
        <van-button class="retry-btn" @click="initDate">点击重试</van-button>
      </div>
      <!-- /加载失败：其它未知错误（例如网络原因或服务端异常） -->
    </div>
  </div>
</template>

<script>
import "./github-markdown.css";
// $router.params.articleId (读取文章数据)
import { getArticleDetail } from "@/api/article";
import { ImagePreview } from "vant";
import FollowUser from "../../components/follow-user.vue";
import CollectArticle from "../../components/collect-article.vue";
import ZanArticle from "../../components/zan-article.vue";

export default {
  name: "ArticleIndex",
  components: {
    FollowUser,
    CollectArticle,
    ZanArticle,
  },
  props: {
    // 使用props获取动态路由的数据
    articleId: {
      type: [Number, String],
      required: true,
    },
  },
  data() {
    return {
      articleInfo: {},
      code: 1,
      isLoading: false,
    };
  },
  methods: {
    async initDate() {
      try {
        this.code = 1;
        let { data } = await getArticleDetail(this.articleId);
        // console.log(data);
        this.articleInfo = data.data;
        this.code = 2;
        console.log(data);
        this.$nextTick(() => {
          // console.log(this.$refs.content);
          // const imgNode = this.$refs.content.querySelectorAll("img");
          // console.log(imgNode);
          this.bindImg();
        });
      } catch (error) {
        if (this.error && this.error.response && this.error.status === 404)
          this.code = 3;
        this.code = 4;
        console.log(error);
      }
    },
    bindImg() {
      this.$nextTick(() => {
        console.log(this.$refs.content);
        const imgNode = this.$refs.content.querySelectorAll("img");
        // console.log(imgNode);
        // const imgNode = this.$refs.content.querySelectorAll("img");

        const imgURLs = [];
        imgNode.forEach((img, idx) => {
          imgURLs.push(img.src);
          img.onclick = () => {
            ImagePreview;
            ({
              images: imgURLs,
              startPosition: idx,
            });
          };
        });
      });
    },
  },
  created() {
    this.initDate();
  },
};
</script>

<style scoped lang="less"  >
.article-container {
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
  }
  .article-detail {
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }
    .van-icon {
      font-size: 40px;
      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
  }
}
</style>
